Pen



FIG. 1 is a isometric view of a pen of the present invention;

FIG. 2 is a right side view of the pen of FIG. 1;

FIG. 3 is a front view of the pen shown in FIG. 1;

FIG. 4 is a left side view of the pen shown in FIG. 1;

FIG. 5 is a back view of the pen of FIG. 1;

FIG. 6 is a top plan view of the pen shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the pen shown in FIG. 1. 

The ornamental design for a pen, as shown and described. 